Concept information
Preferred term
A stars
Definition
- A star whose spectrum shows strong hydrogen Balmer lines accompanied by many faint to moderately strong metallic lines. In contrast to B and O stars, the lines of He I and He II are absent. Their surface temperature ranges from 7,500 to 10,000 K. The main metallic lines seen in A-type stars are those of Fe I and Fe II, Cr I and II, Ti I and II, and account for about two-thirds of all lines. Some famous examples of A star are Sirius, Deneb, Altair, and Vega. Also known as A-type star. (en)
Broader concept
- Early-type stars (en)
- Stellar spectral types (en)
Narrower concepts
- A dwarf stars (en)
- Ae stars (en)
- A giant stars (en)
- Am stars (en)
- Ap stars (en)
- A subdwarf stars (en)
- A subgiant stars (en)
- A supergiant stars (en)
Entry terms
- A type stars (en)
- A-type stars (en)
- Class A stars (en)
- Type A stars (en)
Editorial note
URI
http://astrothesaurus.org/uat/5
{{label}}
{{#each values }} {{! loop through ConceptPropertyValue objects }}
{{#if prefLabel }}
{{/if}}
{{/each}}
{{#if notation }}{{ notation }} {{/if}}{{ prefLabel }}
{{#ifDifferentLabelLang lang }} ({{ lang }}){{/ifDifferentLabelLang}}
{{#if vocabName }}
{{ vocabName }}
{{/if}}